Adding a field to a list in a custom document library

To add a field to a list for a document library, do the following:

1. Open the Program Files\Common Files\Microsoft Shared\web server extensions\50\Templates\1033\Layouts directory.
2. Copy the entire contents of the DocLib folder to the directory, renaming the copy, for example, MyDocLib.
3. In the new MyDocLib directory, open SCHEMA.XML.
4. Find the Fields element within the opening MetaData section. Between the opening and closing <Fields> tags, add a Field element like the following:

   <Field Name="EmployeeID" DisplayName="Employee ID" Type="Number" Required="TRUE"
     Description="Enter the ID from your employee badge."/>